blood vessels

• What is the primary function of the heart in the circulatory system?

  It acts as the system's pump
• What are the three types of blood vessels discussed in this video?

  Arteries, capillaries, and veins
• What is the role of arteries in the circulatory system?

  • Carry blood away from the heart
  • Transport oxygenated blood (except pulmonary arteries)
• What is the role of capillaries in the circulatory system?

  • Exchange nutrients and oxygen with tissues
  • Remove waste products like carbon dioxide
• What is the role of veins in the circulatory system?

  • Carry blood back to the heart
  • Transport deoxygenated blood (except pulmonary veins)
• Why do arteries need to be strong and elastic?

  To withstand high pressures from blood pumped out of the heart
• What type of tissue do arteries have to maintain strength?

  A thick layer of muscle tissue
• What type of tissue do arteries have to allow for stretching?

  A thick layer of elastic tissue
• What is the lumen of a blood vessel?

  The hole or space in the middle of the vessel
• How are capillaries adapted for their function?

  They have walls that are only a single cell thick and are permeable
• What is the total cross-sectional area of capillaries compared to arteries?

  It is much larger than that of arteries
• Why does blood flow more slowly in capillaries?

  Because the total cross-sectional area is much larger
• What do veins have that prevents blood from flowing backwards?

  Valves
• What is the typical question format for calculating blood flow rate?

  It involves dividing the volume of blood by the time taken
• What is the pressure of blood in veins compared to arteries?

  It is much lower than in arteries
• If 2500 ml of blood passes through the aorta in 8 minutes, what is the rate of blood flow?

  320 milliliters per minute
• What is the volume of blood mentioned that passes through the aorta?

  2500 ml
• How long does it take for the blood to pass through the aorta in the example given?

  8 minutes